The North American P-51 Mustang: A “Little Friend” with a Big …
https://www.nationalww2museum.org/war/articles/north-american-p-51-mustang
WEBInstead of P-40s, North American offered to design a new fighter which became the P-51 Mustang. The P-51 prototype was ready on September 9, 1940, and it first flew October 26, 1940. It was an astonishing accomplishment for North American: they had delivered a brand new, prototype aircraft in a mere 102 days and flew it weeks later.
DA: 63 PA: 70 MOZ Rank: 77